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Commit | Line | Data |
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f0cbd3ec FB |
1 | /* |
2 | * Copyright (c) 1982, 1986, 1988, 1990, 1993 | |
3 | * The Regents of the University of California. All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | * SUCH DAMAGE. | |
32 | * | |
33 | * @(#)udp_usrreq.c 8.4 (Berkeley) 1/21/94 | |
34 | * udp_usrreq.c,v 1.4 1994/10/02 17:48:45 phk Exp | |
35 | */ | |
36 | ||
37 | /* | |
38 | * Changes and additions relating to SLiRP | |
39 | * Copyright (c) 1995 Danny Gasparovski. | |
5fafdf24 TS |
40 | * |
41 | * Please read the file COPYRIGHT for the | |
f0cbd3ec FB |
42 | * terms and conditions of the copyright. |
43 | */ | |
44 | ||
45 | #include <slirp.h> | |
46 | #include "ip_icmp.h" | |
47 | ||
31a60e22 | 48 | #ifdef LOG_ENABLED |
f0cbd3ec | 49 | struct udpstat udpstat; |
31a60e22 | 50 | #endif |
f0cbd3ec FB |
51 | |
52 | struct socket udb; | |
53 | ||
9634d903 BS |
54 | static u_int8_t udp_tos(struct socket *so); |
55 | static void udp_emu(struct socket *so, struct mbuf *m); | |
56 | ||
f0cbd3ec FB |
57 | /* |
58 | * UDP protocol implementation. | |
59 | * Per RFC 768, August, 1980. | |
60 | */ | |
61 | #ifndef COMPAT_42 | |
9634d903 | 62 | #define UDPCKSUM 1 |
f0cbd3ec | 63 | #else |
9634d903 | 64 | #define UDPCKSUM 0 /* XXX */ |
f0cbd3ec FB |
65 | #endif |
66 | ||
67 | struct socket *udp_last_so = &udb; | |
68 | ||
69 | void | |
70 | udp_init() | |
71 | { | |
72 | udb.so_next = udb.so_prev = &udb; | |
73 | } | |
5fafdf24 TS |
74 | /* m->m_data points at ip packet header |
75 | * m->m_len length ip packet | |
f0cbd3ec FB |
76 | * ip->ip_len length data (IPDU) |
77 | */ | |
78 | void | |
79 | udp_input(m, iphlen) | |
80 | register struct mbuf *m; | |
81 | int iphlen; | |
82 | { | |
83 | register struct ip *ip; | |
84 | register struct udphdr *uh; | |
85 | /* struct mbuf *opts = 0;*/ | |
86 | int len; | |
5fafdf24 | 87 | struct ip save_ip; |
f0cbd3ec | 88 | struct socket *so; |
5fafdf24 | 89 | |
f0cbd3ec FB |
90 | DEBUG_CALL("udp_input"); |
91 | DEBUG_ARG("m = %lx", (long)m); | |
92 | DEBUG_ARG("iphlen = %d", iphlen); | |
5fafdf24 | 93 | |
31a60e22 | 94 | STAT(udpstat.udps_ipackets++); |
f0cbd3ec FB |
95 | |
96 | /* | |
97 | * Strip IP options, if any; should skip this, | |
98 | * make available to user, and use on returned packets, | |
99 | * but we don't yet have a way to check the checksum | |
100 | * with options still present. | |
101 | */ | |
102 | if(iphlen > sizeof(struct ip)) { | |
103 | ip_stripoptions(m, (struct mbuf *)0); | |
104 | iphlen = sizeof(struct ip); | |
105 | } | |
106 | ||
107 | /* | |
108 | * Get IP and UDP header together in first mbuf. | |
109 | */ | |
110 | ip = mtod(m, struct ip *); | |
111 | uh = (struct udphdr *)((caddr_t)ip + iphlen); | |
112 | ||
113 | /* | |
114 | * Make mbuf data length reflect UDP length. | |
115 | * If not enough data to reflect UDP length, drop. | |
116 | */ | |
117 | len = ntohs((u_int16_t)uh->uh_ulen); | |
118 | ||
119 | if (ip->ip_len != len) { | |
120 | if (len > ip->ip_len) { | |
31a60e22 | 121 | STAT(udpstat.udps_badlen++); |
f0cbd3ec FB |
122 | goto bad; |
123 | } | |
124 | m_adj(m, len - ip->ip_len); | |
125 | ip->ip_len = len; | |
126 | } | |
5fafdf24 | 127 | |
f0cbd3ec FB |
128 | /* |
129 | * Save a copy of the IP header in case we want restore it | |
130 | * for sending an ICMP error message in response. | |
131 | */ | |
5fafdf24 | 132 | save_ip = *ip; |
f0cbd3ec FB |
133 | save_ip.ip_len+= iphlen; /* tcp_input subtracts this */ |
134 | ||
135 | /* | |
136 | * Checksum extended UDP header and data. | |
137 | */ | |
9634d903 | 138 | if (UDPCKSUM && uh->uh_sum) { |
f0cbd3ec FB |
139 | ((struct ipovly *)ip)->ih_next = 0; |
140 | ((struct ipovly *)ip)->ih_prev = 0; | |
141 | ((struct ipovly *)ip)->ih_x1 = 0; | |
142 | ((struct ipovly *)ip)->ih_len = uh->uh_ulen; | |
143 | /* keep uh_sum for ICMP reply | |
5fafdf24 TS |
144 | * uh->uh_sum = cksum(m, len + sizeof (struct ip)); |
145 | * if (uh->uh_sum) { | |
f0cbd3ec FB |
146 | */ |
147 | if(cksum(m, len + sizeof(struct ip))) { | |
31a60e22 | 148 | STAT(udpstat.udps_badsum++); |
f0cbd3ec FB |
149 | goto bad; |
150 | } | |
151 | } | |
152 | ||
153 | /* | |
154 | * handle DHCP/BOOTP | |
155 | */ | |
156 | if (ntohs(uh->uh_dport) == BOOTP_SERVER) { | |
157 | bootp_input(m); | |
158 | goto bad; | |
159 | } | |
160 | ||
a9ba3a85 AL |
161 | if (slirp_restrict) |
162 | goto bad; | |
163 | ||
c7f74643 FB |
164 | /* |
165 | * handle TFTP | |
166 | */ | |
167 | if (ntohs(uh->uh_dport) == TFTP_SERVER) { | |
168 | tftp_input(m); | |
169 | goto bad; | |
170 | } | |
171 | ||
f0cbd3ec FB |
172 | /* |
173 | * Locate pcb for datagram. | |
174 | */ | |
175 | so = udp_last_so; | |
176 | if (so->so_lport != uh->uh_sport || | |
177 | so->so_laddr.s_addr != ip->ip_src.s_addr) { | |
178 | struct socket *tmp; | |
3b46e624 | 179 | |
f0cbd3ec FB |
180 | for (tmp = udb.so_next; tmp != &udb; tmp = tmp->so_next) { |
181 | if (tmp->so_lport == uh->uh_sport && | |
182 | tmp->so_laddr.s_addr == ip->ip_src.s_addr) { | |
183 | tmp->so_faddr.s_addr = ip->ip_dst.s_addr; | |
184 | tmp->so_fport = uh->uh_dport; | |
185 | so = tmp; | |
186 | break; | |
187 | } | |
188 | } | |
189 | if (tmp == &udb) { | |
190 | so = NULL; | |
191 | } else { | |
31a60e22 | 192 | STAT(udpstat.udpps_pcbcachemiss++); |
f0cbd3ec FB |
193 | udp_last_so = so; |
194 | } | |
195 | } | |
5fafdf24 | 196 | |
f0cbd3ec FB |
197 | if (so == NULL) { |
198 | /* | |
199 | * If there's no socket for this packet, | |
200 | * create one | |
201 | */ | |
202 | if ((so = socreate()) == NULL) goto bad; | |
203 | if(udp_attach(so) == -1) { | |
5fafdf24 | 204 | DEBUG_MISC((dfd," udp_attach errno = %d-%s\n", |
f0cbd3ec FB |
205 | errno,strerror(errno))); |
206 | sofree(so); | |
207 | goto bad; | |
208 | } | |
3b46e624 | 209 | |
f0cbd3ec FB |
210 | /* |
211 | * Setup fields | |
212 | */ | |
213 | /* udp_last_so = so; */ | |
214 | so->so_laddr = ip->ip_src; | |
215 | so->so_lport = uh->uh_sport; | |
3b46e624 | 216 | |
f0cbd3ec FB |
217 | if ((so->so_iptos = udp_tos(so)) == 0) |
218 | so->so_iptos = ip->ip_tos; | |
3b46e624 | 219 | |
f0cbd3ec FB |
220 | /* |
221 | * XXXXX Here, check if it's in udpexec_list, | |
222 | * and if it is, do the fork_exec() etc. | |
223 | */ | |
224 | } | |
225 | ||
54fd9cdf TS |
226 | so->so_faddr = ip->ip_dst; /* XXX */ |
227 | so->so_fport = uh->uh_dport; /* XXX */ | |
228 | ||
f0cbd3ec FB |
229 | iphlen += sizeof(struct udphdr); |
230 | m->m_len -= iphlen; | |
231 | m->m_data += iphlen; | |
232 | ||
233 | /* | |
234 | * Now we sendto() the packet. | |
235 | */ | |
236 | if (so->so_emu) | |
237 | udp_emu(so, m); | |
238 | ||
239 | if(sosendto(so,m) == -1) { | |
240 | m->m_len += iphlen; | |
241 | m->m_data -= iphlen; | |
242 | *ip=save_ip; | |
243 | DEBUG_MISC((dfd,"udp tx errno = %d-%s\n",errno,strerror(errno))); | |
3b46e624 | 244 | icmp_error(m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,strerror(errno)); |
f0cbd3ec FB |
245 | } |
246 | ||
247 | m_free(so->so_m); /* used for ICMP if error on sorecvfrom */ | |
248 | ||
249 | /* restore the orig mbuf packet */ | |
250 | m->m_len += iphlen; | |
251 | m->m_data -= iphlen; | |
252 | *ip=save_ip; | |
253 | so->so_m=m; /* ICMP backup */ | |
254 | ||
255 | return; | |
256 | bad: | |
257 | m_freem(m); | |
258 | /* if (opts) m_freem(opts); */ | |
259 | return; | |
260 | } | |
261 | ||
5fafdf24 | 262 | int udp_output2(struct socket *so, struct mbuf *m, |
f0cbd3ec FB |
263 | struct sockaddr_in *saddr, struct sockaddr_in *daddr, |
264 | int iptos) | |
265 | { | |
266 | register struct udpiphdr *ui; | |
267 | int error = 0; | |
268 | ||
269 | DEBUG_CALL("udp_output"); | |
270 | DEBUG_ARG("so = %lx", (long)so); | |
271 | DEBUG_ARG("m = %lx", (long)m); | |
272 | DEBUG_ARG("saddr = %lx", (long)saddr->sin_addr.s_addr); | |
273 | DEBUG_ARG("daddr = %lx", (long)daddr->sin_addr.s_addr); | |
274 | ||
275 | /* | |
276 | * Adjust for header | |
277 | */ | |
278 | m->m_data -= sizeof(struct udpiphdr); | |
279 | m->m_len += sizeof(struct udpiphdr); | |
5fafdf24 | 280 | |
f0cbd3ec FB |
281 | /* |
282 | * Fill in mbuf with extended UDP header | |
283 | * and addresses and length put into network format. | |
284 | */ | |
285 | ui = mtod(m, struct udpiphdr *); | |
286 | ui->ui_next = ui->ui_prev = 0; | |
287 | ui->ui_x1 = 0; | |
288 | ui->ui_pr = IPPROTO_UDP; | |
289 | ui->ui_len = htons(m->m_len - sizeof(struct ip)); /* + sizeof (struct udphdr)); */ | |
290 | /* XXXXX Check for from-one-location sockets, or from-any-location sockets */ | |
291 | ui->ui_src = saddr->sin_addr; | |
292 | ui->ui_dst = daddr->sin_addr; | |
293 | ui->ui_sport = saddr->sin_port; | |
294 | ui->ui_dport = daddr->sin_port; | |
295 | ui->ui_ulen = ui->ui_len; | |
296 | ||
297 | /* | |
298 | * Stuff checksum and output datagram. | |
299 | */ | |
300 | ui->ui_sum = 0; | |
9634d903 | 301 | if (UDPCKSUM) { |
f0cbd3ec FB |
302 | if ((ui->ui_sum = cksum(m, /* sizeof (struct udpiphdr) + */ m->m_len)) == 0) |
303 | ui->ui_sum = 0xffff; | |
304 | } | |
305 | ((struct ip *)ui)->ip_len = m->m_len; | |
306 | ||
9634d903 | 307 | ((struct ip *)ui)->ip_ttl = IPDEFTTL; |
f0cbd3ec | 308 | ((struct ip *)ui)->ip_tos = iptos; |
5fafdf24 | 309 | |
31a60e22 | 310 | STAT(udpstat.udps_opackets++); |
5fafdf24 | 311 | |
f0cbd3ec | 312 | error = ip_output(so, m); |
5fafdf24 | 313 | |
f0cbd3ec FB |
314 | return (error); |
315 | } | |
316 | ||
5fafdf24 | 317 | int udp_output(struct socket *so, struct mbuf *m, |
f0cbd3ec FB |
318 | struct sockaddr_in *addr) |
319 | ||
320 | { | |
321 | struct sockaddr_in saddr, daddr; | |
322 | ||
323 | saddr = *addr; | |
f3ae0704 | 324 | if ((so->so_faddr.s_addr & htonl(0xffffff00)) == special_addr.s_addr) { |
c904d61f FB |
325 | if ((so->so_faddr.s_addr & htonl(0x000000ff)) == htonl(0xff)) |
326 | saddr.sin_addr.s_addr = alias_addr.s_addr; | |
f3ae0704 | 327 | else if (addr->sin_addr.s_addr == loopback_addr.s_addr || |
242acf3a | 328 | (ntohl(so->so_faddr.s_addr) & 0xff) != CTL_ALIAS) |
f3ae0704 | 329 | saddr.sin_addr.s_addr = so->so_faddr.s_addr; |
c904d61f | 330 | } |
f0cbd3ec FB |
331 | daddr.sin_addr = so->so_laddr; |
332 | daddr.sin_port = so->so_lport; | |
3b46e624 | 333 | |
f0cbd3ec FB |
334 | return udp_output2(so, m, &saddr, &daddr, so->so_iptos); |
335 | } | |
336 | ||
337 | int | |
338 | udp_attach(so) | |
339 | struct socket *so; | |
340 | { | |
341 | struct sockaddr_in addr; | |
5fafdf24 | 342 | |
f0cbd3ec FB |
343 | if((so->s = socket(AF_INET,SOCK_DGRAM,0)) != -1) { |
344 | /* | |
345 | * Here, we bind() the socket. Although not really needed | |
346 | * (sendto() on an unbound socket will bind it), it's done | |
347 | * here so that emulation of ytalk etc. don't have to do it | |
348 | */ | |
349 | addr.sin_family = AF_INET; | |
350 | addr.sin_port = 0; | |
351 | addr.sin_addr.s_addr = INADDR_ANY; | |
352 | if(bind(so->s, (struct sockaddr *)&addr, sizeof(addr))<0) { | |
353 | int lasterrno=errno; | |
379ff53d | 354 | closesocket(so->s); |
f0cbd3ec | 355 | so->s=-1; |
02d2c54c FB |
356 | #ifdef _WIN32 |
357 | WSASetLastError(lasterrno); | |
358 | #else | |
f0cbd3ec | 359 | errno=lasterrno; |
02d2c54c | 360 | #endif |
f0cbd3ec FB |
361 | } else { |
362 | /* success, insert in queue */ | |
363 | so->so_expire = curtime + SO_EXPIRE; | |
364 | insque(so,&udb); | |
365 | } | |
366 | } | |
367 | return(so->s); | |
368 | } | |
369 | ||
370 | void | |
371 | udp_detach(so) | |
372 | struct socket *so; | |
373 | { | |
379ff53d | 374 | closesocket(so->s); |
f0cbd3ec FB |
375 | /* if (so->so_m) m_free(so->so_m); done by sofree */ |
376 | ||
377 | sofree(so); | |
378 | } | |
379 | ||
9634d903 | 380 | static const struct tos_t udptos[] = { |
f0cbd3ec FB |
381 | {0, 53, IPTOS_LOWDELAY, 0}, /* DNS */ |
382 | {517, 517, IPTOS_LOWDELAY, EMU_TALK}, /* talk */ | |
383 | {518, 518, IPTOS_LOWDELAY, EMU_NTALK}, /* ntalk */ | |
384 | {0, 7648, IPTOS_LOWDELAY, EMU_CUSEEME}, /* Cu-Seeme */ | |
385 | {0, 0, 0, 0} | |
386 | }; | |
387 | ||
9634d903 BS |
388 | static u_int8_t |
389 | udp_tos(struct socket *so) | |
f0cbd3ec FB |
390 | { |
391 | int i = 0; | |
5fafdf24 | 392 | |
f0cbd3ec FB |
393 | while(udptos[i].tos) { |
394 | if ((udptos[i].fport && ntohs(so->so_fport) == udptos[i].fport) || | |
395 | (udptos[i].lport && ntohs(so->so_lport) == udptos[i].lport)) { | |
396 | so->so_emu = udptos[i].emu; | |
397 | return udptos[i].tos; | |
398 | } | |
399 | i++; | |
400 | } | |
5fafdf24 | 401 | |
f0cbd3ec FB |
402 | return 0; |
403 | } | |
404 | ||
405 | #ifdef EMULATE_TALK | |
406 | #include "talkd.h" | |
407 | #endif | |
408 | ||
409 | /* | |
410 | * Here, talk/ytalk/ntalk requests must be emulated | |
411 | */ | |
9634d903 BS |
412 | static void |
413 | udp_emu(struct socket *so, struct mbuf *m) | |
f0cbd3ec FB |
414 | { |
415 | struct sockaddr_in addr; | |
242acf3a | 416 | socklen_t addrlen = sizeof(addr); |
f0cbd3ec FB |
417 | #ifdef EMULATE_TALK |
418 | CTL_MSG_OLD *omsg; | |
419 | CTL_MSG *nmsg; | |
420 | char buff[sizeof(CTL_MSG)]; | |
421 | u_char type; | |
5fafdf24 | 422 | |
f0cbd3ec FB |
423 | struct talk_request { |
424 | struct talk_request *next; | |
425 | struct socket *udp_so; | |
426 | struct socket *tcp_so; | |
427 | } *req; | |
5fafdf24 TS |
428 | |
429 | static struct talk_request *req_tbl = 0; | |
430 | ||
f0cbd3ec | 431 | #endif |
5fafdf24 | 432 | |
f0cbd3ec | 433 | struct cu_header { |
101c5935 FB |
434 | uint16_t d_family; // destination family |
435 | uint16_t d_port; // destination port | |
436 | uint32_t d_addr; // destination address | |
437 | uint16_t s_family; // source family | |
438 | uint16_t s_port; // source port | |
51a36cb2 | 439 | uint32_t so_addr; // source address |
101c5935 FB |
440 | uint32_t seqn; // sequence number |
441 | uint16_t message; // message | |
442 | uint16_t data_type; // data type | |
443 | uint16_t pkt_len; // packet length | |
f0cbd3ec FB |
444 | } *cu_head; |
445 | ||
446 | switch(so->so_emu) { | |
447 | ||
448 | #ifdef EMULATE_TALK | |
449 | case EMU_TALK: | |
450 | case EMU_NTALK: | |
451 | /* | |
452 | * Talk emulation. We always change the ctl_addr to get | |
453 | * some answers from the daemon. When an ANNOUNCE comes, | |
454 | * we send LEAVE_INVITE to the local daemons. Also when a | |
455 | * DELETE comes, we send copies to the local daemons. | |
456 | */ | |
457 | if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0) | |
458 | return; | |
3b46e624 | 459 | |
f0cbd3ec FB |
460 | #define IS_OLD (so->so_emu == EMU_TALK) |
461 | ||
462 | #define COPY_MSG(dest, src) { dest->type = src->type; \ | |
463 | dest->id_num = src->id_num; \ | |
464 | dest->pid = src->pid; \ | |
465 | dest->addr = src->addr; \ | |
466 | dest->ctl_addr = src->ctl_addr; \ | |
467 | memcpy(&dest->l_name, &src->l_name, NAME_SIZE_OLD); \ | |
468 | memcpy(&dest->r_name, &src->r_name, NAME_SIZE_OLD); \ | |
469 | memcpy(&dest->r_tty, &src->r_tty, TTY_SIZE); } | |
470 | ||
471 | #define OTOSIN(ptr, field) ((struct sockaddr_in *)&ptr->field) | |
472 | /* old_sockaddr to sockaddr_in */ | |
473 | ||
474 | ||
475 | if (IS_OLD) { /* old talk */ | |
476 | omsg = mtod(m, CTL_MSG_OLD*); | |
477 | nmsg = (CTL_MSG *) buff; | |
478 | type = omsg->type; | |
479 | OTOSIN(omsg, ctl_addr)->sin_port = addr.sin_port; | |
480 | OTOSIN(omsg, ctl_addr)->sin_addr = our_addr; | |
be15b141 | 481 | pstrcpy(omsg->l_name, NAME_SIZE_OLD, getlogin()); |
5fafdf24 | 482 | } else { /* new talk */ |
f0cbd3ec FB |
483 | omsg = (CTL_MSG_OLD *) buff; |
484 | nmsg = mtod(m, CTL_MSG *); | |
485 | type = nmsg->type; | |
486 | OTOSIN(nmsg, ctl_addr)->sin_port = addr.sin_port; | |
487 | OTOSIN(nmsg, ctl_addr)->sin_addr = our_addr; | |
be15b141 | 488 | pstrcpy(nmsg->l_name, NAME_SIZE_OLD, getlogin()); |
f0cbd3ec | 489 | } |
3b46e624 | 490 | |
5fafdf24 | 491 | if (type == LOOK_UP) |
f0cbd3ec | 492 | return; /* for LOOK_UP this is enough */ |
3b46e624 | 493 | |
f0cbd3ec FB |
494 | if (IS_OLD) { /* make a copy of the message */ |
495 | COPY_MSG(nmsg, omsg); | |
496 | nmsg->vers = 1; | |
497 | nmsg->answer = 0; | |
498 | } else | |
499 | COPY_MSG(omsg, nmsg); | |
500 | ||
501 | /* | |
502 | * If if is an ANNOUNCE message, we go through the | |
503 | * request table to see if a tcp port has already | |
504 | * been redirected for this socket. If not, we solisten() | |
505 | * a new socket and add this entry to the table. | |
506 | * The port number of the tcp socket and our IP | |
507 | * are put to the addr field of the message structures. | |
508 | * Then a LEAVE_INVITE is sent to both local daemon | |
509 | * ports, 517 and 518. This is why we have two copies | |
510 | * of the message, one in old talk and one in new talk | |
511 | * format. | |
5fafdf24 | 512 | */ |
f0cbd3ec FB |
513 | |
514 | if (type == ANNOUNCE) { | |
515 | int s; | |
516 | u_short temp_port; | |
3b46e624 | 517 | |
f0cbd3ec FB |
518 | for(req = req_tbl; req; req = req->next) |
519 | if (so == req->udp_so) | |
520 | break; /* found it */ | |
3b46e624 | 521 | |
f0cbd3ec FB |
522 | if (!req) { /* no entry for so, create new */ |
523 | req = (struct talk_request *) | |
524 | malloc(sizeof(struct talk_request)); | |
525 | req->udp_so = so; | |
3b46e624 | 526 | req->tcp_so = solisten(0, |
5fafdf24 | 527 | OTOSIN(omsg, addr)->sin_addr.s_addr, |
f0cbd3ec FB |
528 | OTOSIN(omsg, addr)->sin_port, |
529 | SS_FACCEPTONCE); | |
530 | req->next = req_tbl; | |
531 | req_tbl = req; | |
3b46e624 TS |
532 | } |
533 | ||
f0cbd3ec FB |
534 | /* replace port number in addr field */ |
535 | addrlen = sizeof(addr); | |
5fafdf24 | 536 | getsockname(req->tcp_so->s, |
f0cbd3ec | 537 | (struct sockaddr *) &addr, |
3b46e624 | 538 | &addrlen); |
f0cbd3ec FB |
539 | OTOSIN(omsg, addr)->sin_port = addr.sin_port; |
540 | OTOSIN(omsg, addr)->sin_addr = our_addr; | |
541 | OTOSIN(nmsg, addr)->sin_port = addr.sin_port; | |
3b46e624 TS |
542 | OTOSIN(nmsg, addr)->sin_addr = our_addr; |
543 | ||
f0cbd3ec FB |
544 | /* send LEAVE_INVITEs */ |
545 | temp_port = OTOSIN(omsg, ctl_addr)->sin_port; | |
546 | OTOSIN(omsg, ctl_addr)->sin_port = 0; | |
547 | OTOSIN(nmsg, ctl_addr)->sin_port = 0; | |
3b46e624 TS |
548 | omsg->type = nmsg->type = LEAVE_INVITE; |
549 | ||
f0cbd3ec FB |
550 | s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP); |
551 | addr.sin_addr = our_addr; | |
552 | addr.sin_family = AF_INET; | |
553 | addr.sin_port = htons(517); | |
5fafdf24 | 554 | sendto(s, (char *)omsg, sizeof(*omsg), 0, |
f0cbd3ec FB |
555 | (struct sockaddr *)&addr, sizeof(addr)); |
556 | addr.sin_port = htons(518); | |
557 | sendto(s, (char *)nmsg, sizeof(*nmsg), 0, | |
558 | (struct sockaddr *) &addr, sizeof(addr)); | |
379ff53d | 559 | closesocket(s) ; |
f0cbd3ec | 560 | |
5fafdf24 | 561 | omsg->type = nmsg->type = ANNOUNCE; |
f0cbd3ec FB |
562 | OTOSIN(omsg, ctl_addr)->sin_port = temp_port; |
563 | OTOSIN(nmsg, ctl_addr)->sin_port = temp_port; | |
564 | } | |
3b46e624 | 565 | |
5fafdf24 | 566 | /* |
f0cbd3ec FB |
567 | * If it is a DELETE message, we send a copy to the |
568 | * local daemons. Then we delete the entry corresponding | |
569 | * to our socket from the request table. | |
570 | */ | |
3b46e624 | 571 | |
f0cbd3ec FB |
572 | if (type == DELETE) { |
573 | struct talk_request *temp_req, *req_next; | |
574 | int s; | |
575 | u_short temp_port; | |
3b46e624 | 576 | |
f0cbd3ec FB |
577 | temp_port = OTOSIN(omsg, ctl_addr)->sin_port; |
578 | OTOSIN(omsg, ctl_addr)->sin_port = 0; | |
579 | OTOSIN(nmsg, ctl_addr)->sin_port = 0; | |
3b46e624 | 580 | |
f0cbd3ec FB |
581 | s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP); |
582 | addr.sin_addr = our_addr; | |
583 | addr.sin_family = AF_INET; | |
584 | addr.sin_port = htons(517); | |
585 | sendto(s, (char *)omsg, sizeof(*omsg), 0, | |
586 | (struct sockaddr *)&addr, sizeof(addr)); | |
587 | addr.sin_port = htons(518); | |
588 | sendto(s, (char *)nmsg, sizeof(*nmsg), 0, | |
589 | (struct sockaddr *)&addr, sizeof(addr)); | |
379ff53d | 590 | closesocket(s); |
3b46e624 | 591 | |
f0cbd3ec FB |
592 | OTOSIN(omsg, ctl_addr)->sin_port = temp_port; |
593 | OTOSIN(nmsg, ctl_addr)->sin_port = temp_port; | |
594 | ||
595 | /* delete table entry */ | |
596 | if (so == req_tbl->udp_so) { | |
597 | temp_req = req_tbl; | |
598 | req_tbl = req_tbl->next; | |
599 | free(temp_req); | |
600 | } else { | |
601 | temp_req = req_tbl; | |
602 | for(req = req_tbl->next; req; req = req_next) { | |
603 | req_next = req->next; | |
604 | if (so == req->udp_so) { | |
605 | temp_req->next = req_next; | |
606 | free(req); | |
607 | break; | |
608 | } else { | |
609 | temp_req = req; | |
610 | } | |
611 | } | |
612 | } | |
613 | } | |
3b46e624 TS |
614 | |
615 | return; | |
f0cbd3ec | 616 | #endif |
3b46e624 | 617 | |
5fafdf24 TS |
618 | case EMU_CUSEEME: |
619 | ||
f0cbd3ec FB |
620 | /* |
621 | * Cu-SeeMe emulation. | |
622 | * Hopefully the packet is more that 16 bytes long. We don't | |
623 | * do any other tests, just replace the address and port | |
624 | * fields. | |
5fafdf24 | 625 | */ |
f0cbd3ec FB |
626 | if (m->m_len >= sizeof (*cu_head)) { |
627 | if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0) | |
628 | return; | |
629 | cu_head = mtod(m, struct cu_header *); | |
101c5935 | 630 | cu_head->s_port = addr.sin_port; |
51a36cb2 | 631 | cu_head->so_addr = our_addr.s_addr; |
f0cbd3ec | 632 | } |
3b46e624 | 633 | |
f0cbd3ec FB |
634 | return; |
635 | } | |
636 | } | |
637 | ||
638 | struct socket * | |
639 | udp_listen(port, laddr, lport, flags) | |
640 | u_int port; | |
641 | u_int32_t laddr; | |
642 | u_int lport; | |
643 | int flags; | |
644 | { | |
645 | struct sockaddr_in addr; | |
646 | struct socket *so; | |
242acf3a | 647 | socklen_t addrlen = sizeof(struct sockaddr_in), opt = 1; |
5fafdf24 | 648 | |
f0cbd3ec FB |
649 | if ((so = socreate()) == NULL) { |
650 | free(so); | |
651 | return NULL; | |
652 | } | |
653 | so->s = socket(AF_INET,SOCK_DGRAM,0); | |
654 | so->so_expire = curtime + SO_EXPIRE; | |
655 | insque(so,&udb); | |
656 | ||
657 | addr.sin_family = AF_INET; | |
658 | addr.sin_addr.s_addr = INADDR_ANY; | |
659 | addr.sin_port = port; | |
660 | ||
661 | if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0) { | |
662 | udp_detach(so); | |
663 | return NULL; | |
664 | } | |
665 | setsockopt(so->s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int)); | |
666 | /* setsockopt(so->s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int)); */ | |
5fafdf24 | 667 | |
f0cbd3ec FB |
668 | getsockname(so->s,(struct sockaddr *)&addr,&addrlen); |
669 | so->so_fport = addr.sin_port; | |
670 | if (addr.sin_addr.s_addr == 0 || addr.sin_addr.s_addr == loopback_addr.s_addr) | |
8dbca8dd | 671 | so->so_faddr = alias_addr; |
f0cbd3ec FB |
672 | else |
673 | so->so_faddr = addr.sin_addr; | |
5fafdf24 | 674 | |
f0cbd3ec FB |
675 | so->so_lport = lport; |
676 | so->so_laddr.s_addr = laddr; | |
677 | if (flags != SS_FACCEPTONCE) | |
678 | so->so_expire = 0; | |
5fafdf24 | 679 | |
f0cbd3ec | 680 | so->so_state = SS_ISFCONNECTED; |
5fafdf24 | 681 | |
f0cbd3ec FB |
682 | return so; |
683 | } |